img.sum()

[gillins]

Original report by alan piszcz (Bitbucket: apiszcz, GitHub: apiszcz).

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The documentation example shows inputs.img.sum(), when I try this I am getting an error.
The applier example does not show how 'inputs' is set.
I tried a list of file names, which does support the method sum.
Not sure what I'm doing wrong here.

#!python

> py lib\_learn\rios\accum.py
Images aren't on the same grid
Creating output file that is 1503P x 1241L.
Processing input file file2.tif.
0Traceback (most recent call last):
  File "lib\_learn\rios\accum.py", line 46, in <module>
    applier.apply(accum, infiles, outfiles, otherargs, controls=controls)
  File "lib\rios\applier.py", line 667, in apply
    userFunction(*params)
  File "lib\_learn\rios\accum.py", line 24, in accum
    tot = float(inputs.img.sum())
AttributeError: 'BlockAssociations' object has no attribute 'img'

#!python


def accum(info, inputs, outputs, otherargs):
    tot = float(inputs.img.sum())
    n = inputs.img.size
    otherargs.tot += tot
    otherargs.count += n


infiles = applier.FilenameAssociations()
infiles.img = ["file1.tif","file2.tif"]

outfiles = applier.FilenameAssociations()
outfiles.outimage = "outfile.tif"

controls = applier.ApplierControls()
controls.setReferenceImage(infiles.image1)
controls.progress = cuiprogress.GDALProgressBar()
controls.setOutputDriverName("GTiff")
controls.setCreationOptions(["COMPRESS=DEFLATE"])

otherargs = applier.OtherInputs()
otherargs.tot = 0.0
otherargs.count = 0
applier.apply(accum, infiles, outfiles, otherargs, controls=controls)
print('Average value = ', otherargs.tot / otherargs.count)

[gillins]

Original comment by Neil Flood (Bitbucket: neilflood, GitHub: neilflood).

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Hi Alan,

you have given infiles.img a list of filenames, and this means that the resulting img field on the inputs object inside your function will itself be a list of numpy arrays, one from each file in the same order. The list datatype does not support a .sum() method.

In addition, you have used the setReferenceImage() method, giving in infiles.image1, which does not exist. You probably meant to do this:

#!python
controls.setReferenceImage(infiles.img[0])

[gillins]

Original comment by Neil Flood (Bitbucket: neilflood, GitHub: neilflood).

---

Closed. Not a bug.